Malicious PDF — malware analysis report

Static analysis result for SHA-256 6869ba4d0d126451…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 09:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e4d5a7e32c070f56e6fb34a0fda65dc SHA-1: 640869a473358c81f7c9b055d2040abe47cdd7c5 SHA-256: 6869ba4d0d1264510ed62e1031d5f7fe5b1e2ce23edf310d640b05d4b0c6a8c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://surtek.biz/image/files/20150121_132909.pdf In PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/96711561645.pdfIn PDF document text
    • http://shesob.com/file/files/44638141690.pdfIn PDF document text
    • http://martonelektro.hu/files/file/vefexunitikikebon.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/65375149171.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/wizewavabimemiv.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/13628388291.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/bagunegub.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/xipuxazu.pdfIn PDF document text
    • http://brukbet.com/user_images/file/74885513626.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fovowazun.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/7835312006.pdfIn PDF document text
    • http://usateatop.com/_upload/files/856018640.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/708377246.pdfIn PDF document text
    • http://checopharma.com/upload/files/nisede.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/77846653427.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/69547608240.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/linan.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c06d9900---73717053094.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/wuzebuvotevunowineneja.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/50926739997.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/66067290504.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/nesuximofebag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=evaluation+models+in+education+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 10832 bytes
SHA-256: 48fe12053171ac4e2f43a12cc2ac4e9058770d926d2268fd3bf38529e6c75dd6
font_02_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 16592 bytes
SHA-256: c1c956d9836ee5f38df5137be4b513266e055c5226f61250395766c4111a2443

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